/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once
#include <folly/Function.h>
#include <folly/Memory.h>
#include <folly/io/async/EventBase.h>

namespace folly {
namespace test {
class EventBaseBackendProvider {
 public:
  EventBaseBackendProvider() = delete;
  ~EventBaseBackendProvider() = delete;
  using GetBackendFunc =
      folly::Function<std::unique_ptr<folly::EventBaseBackendBase>()>;
  static std::unique_ptr<folly::EventBaseBackendBase> getBackend() {
    CHECK(!!getBackendFunc_);

    return getBackendFunc_();
  }

  static void setGetBackendFunc(GetBackendFunc&& func) {
    getBackendFunc_ = std::move(func);
  }

 private:
  static GetBackendFunc getBackendFunc_;
};
} // namespace test
} // namespace folly
